Can chlorine tablets go bad?

In this brief study, we will answer the question, “can chlorine tablets go bad? and the factors affecting its expiration.

Can chlorine tablets go bad?

Yes, chlorine tablets can go bad if left neglected for an extended time or if they are poorly kept. However, if kept in the proper circumstances, they may stay functional for more than five years.

What are the factors that influence the expiration of the tablets?

The expiration date of chlorine tablets is affected by a variety of factors. In the case of water purification tablets, for example, sunlight, temperature, and moisture all contribute to the degradation of the tablets. As a result, pharmaceutical companies store tablets in brown glass bottles or foils. Users are advised to maintain the tablets properly.

Excessive heat, moisture, or air exposure may cause the tablets’ effectiveness to be significantly reduced. So replace opened bottles or pockets as soon as feasible, which is usually less than a year after they have been opened.

Furthermore, you should be aware that purification tablets may expire rapidly if they are stored in an unclean environment.

How to Check the Expiration of Water Tablets?

If you’re thinking of taking chlorine pills, check the color of the tablets first. Pills that are green or yellowish in hue must be changed as soon as possible. In addition, grey or brown variants are suitable for use in this application. Having said that, some medications may have a shelf life of up to five years from the date of production. 

Once you’ve opened the chlorine tablet package, be sure to store it carefully, away from moisture, sunlight, and other elements. These are the perfect conditions for verifying the safety of your product before it is put to use for the first time.

The chemical makeup of a tablet determines when a product has reached the end of its shelf life. A unique mix of active (sterilizers) and inactive chemicals are used in the manufacture of water purification tablets. When looking at the ingredients list, non-active components are referred to as “Other Ingredients.” They often make for a substantial percentage of the total weight of each pill. Additionally, they not only provide weight to the tablets, but they also help in the stability, solubility, and preservation of the tablets.

The main components of purifying tablets account for just a small percentage of the total weight of the pill. However, all of the components contribute to the sterilizing process, thus this is in contrast to the inactive components.

Expiration Date for Chlorine Water Purification Tablets

Chlorine tablets have a lifespan of between three and five years on average. The main difference, in this case, is the kind of container used, as well as the sort of seal that was used. Individually sealed chlorine purification tablets, on the other hand, have a shelf life of between four and five years when stored properly. Having said that, medicines packed in a plastic container have a three-year shelf life on average. 

How to Preserve the Effectiveness of Water Purification Tablets?

It is essential to maintain the correct temperature for chlorine tablets, which is usually between 15 and 30 degrees Celsius (60 and 86 degrees Fahrenheit). To be more specific, these are the criteria that ensure that the product continues to operate properly until the stated expiration date. In addition, keep your medicines in a dry, cool environment at all times.

It is suggested that you store the tablets away from sources of moisture and heat to maintain their effectiveness. 

How to choose chlorine tablets for your pool? 

Choose a chlorine pill that is suitable for your pool’s pH level and other factors. A 13″ (200g) tablet may be required once a week for a 30,000-liter pool. Furthermore, the size of chlorine tablets varies from one to three inches. As a result, you must make use of one-inch tablets as well as three tablets that are about the same size as the three-inch tablet. In general, 1″ pills dissolve more quickly than 3″ tablets, making them a more cost-effective choice in terms of time and money.

Place the chlorine pills in the feeder, which will enable you to control the rate at which the pills are disintegrating. You may adjust the flow of water by turning a control knob. It’s also important to understand how to turn on the flow control knob to keep the pool level between 1 and 1.5ppm. This will usually be determined by the amount of available flow, the effectiveness of the pumps, and the kind of feeder that is accessible to the system. Given the differences between each pool, it may take some time to get the changes for your pool and make it perfect.


In this brief study, we answered the question, “can chlorine tablets go bad? and the factors affecting its expiration.